1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "base/message_loop.h"
#include "jsapi.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/Attributes.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Hal.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPtr.h"
#include "nsCOMPtr.h"
#include "nsDebug.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsISettingsService.h"
#include "nsJSUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsString.h"
#include "TimeZoneSettingObserver.h"
#include "xpcpublic.h"
#include "nsContentUtils.h"
#include "nsPrintfCString.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/SettingChangeNotificationBinding.h"
#undef LOG
#undef ERR
#define LOG(args...) __android_log_print(ANDROID_LOG_INFO, "Time Zone Setting" , ## args)
#define ERR(args...) __android_log_print(ANDROID_LOG_ERROR, "Time Zone Setting" , ## args)
#define TIME_TIMEZONE "time.timezone"
#define MOZSETTINGS_CHANGED "mozsettings-changed"
using namespace mozilla;
using namespace mozilla::dom;
namespace {
class TimeZoneSettingObserver : public nsIObserver
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
TimeZoneSettingObserver();
static nsresult SetTimeZone(const JS::Value &aValue, JSContext *aContext);
protected:
virtual ~TimeZoneSettingObserver();
};
class TimeZoneSettingCb final : public nsISettingsServiceCallback
{
public:
NS_DECL_ISUPPORTS
TimeZoneSettingCb() {}
NS_IMETHOD Handle(const nsAString &aName, JS::Handle<JS::Value> aResult) {
JSContext *cx = nsContentUtils::GetCurrentJSContext();
NS_ENSURE_TRUE(cx, NS_OK);
// If we don't have time.timezone value in the settings, we need
// to initialize the settings based on the current system timezone
// to make settings consistent with system. This usually happens
// at the very first boot. After that, settings must have a value.
if (aResult.isNull()) {
// Get the current system time zone offset. Note that we need to
// convert the value to a UTC representation in the format of
// "UTC{+,-}hh:mm", so that the Gaia end can know how to interpret.
// E.g., -480 is "UTC+08:00"; 630 is "UTC-10:30".
int32_t timeZoneOffset = hal::GetTimezoneOffset();
nsPrintfCString curTimeZone("UTC%+03d:%02d",
-timeZoneOffset / 60,
abs(timeZoneOffset) % 60);
// Convert it to a JS string.
NS_ConvertUTF8toUTF16 utf16Str(curTimeZone);
JS::Rooted<JSString*> jsStr(cx, JS_NewUCStringCopyN(cx,
utf16Str.get(),
utf16Str.Length()));
if (!jsStr) {
return NS_ERROR_OUT_OF_MEMORY;
}
// Set the settings based on the current system timezone.
nsCOMPtr<nsISettingsServiceLock> lock;
nsCOMPtr<nsISettingsService> settingsService =
do_GetService("@mozilla.org/settingsService;1");
if (!settingsService) {
ERR("Failed to get settingsLock service!");
return NS_OK;
}
settingsService->CreateLock(nullptr, getter_AddRefs(lock));
JS::Rooted<JS::Value> value(cx, JS::StringValue(jsStr));
lock->Set(TIME_TIMEZONE, value, nullptr, nullptr);
return NS_OK;
}
// Set the system timezone based on the current settings.
if (aResult.isString()) {
return TimeZoneSettingObserver::SetTimeZone(aResult, cx);
}
return NS_OK;
}
NS_IMETHOD HandleError(const nsAString &aName) {
ERR("TimeZoneSettingCb::HandleError: %s\n", NS_LossyConvertUTF16toASCII(aName).get());
return NS_OK;
}
protected:
~TimeZoneSettingCb() {}
};
NS_IMPL_ISUPPORTS(TimeZoneSettingCb, nsISettingsServiceCallback)
TimeZoneSettingObserver::TimeZoneSettingObserver()
{
// Setup an observer to watch changes to the setting.
nsCOMPtr<nsIObserverService> observerService = services::GetObserverService();
if (!observerService) {
ERR("GetObserverService failed");
return;
}
nsresult rv;
rv = observerService->AddObserver(this, MOZSETTINGS_CHANGED, false);
if (NS_FAILED(rv)) {
ERR("AddObserver failed");
return;
}
// Read the 'time.timezone' setting in order to start with a known
// value at boot time. The handle() will be called after reading.
nsCOMPtr<nsISettingsServiceLock> lock;
nsCOMPtr<nsISettingsService> settingsService =
do_GetService("@mozilla.org/settingsService;1");
if (!settingsService) {
ERR("Failed to get settingsLock service!");
return;
}
settingsService->CreateLock(nullptr, getter_AddRefs(lock));
nsCOMPtr<nsISettingsServiceCallback> callback = new TimeZoneSettingCb();
lock->Get(TIME_TIMEZONE, callback);
}
nsresult TimeZoneSettingObserver::SetTimeZone(const JS::Value &aValue, JSContext *aContext)
{
// Convert the JS value to a nsCString type.
// The value should be a JS string like "America/Chicago" or "UTC-05:00".
nsAutoJSString valueStr;
if (!valueStr.init(aContext, aValue.toString())) {
ERR("Failed to convert JS value to nsCString");
return NS_ERROR_FAILURE;
}
NS_ConvertUTF16toUTF8 newTimezone(valueStr);
// Hal expects opposite sign from general notations,
// so we need to flip it.
if (newTimezone.Find(NS_LITERAL_CSTRING("UTC+")) == 0) {
if (!newTimezone.SetCharAt('-', 3)) {
return NS_ERROR_FAILURE;
}
} else if (newTimezone.Find(NS_LITERAL_CSTRING("UTC-")) == 0) {
if (!newTimezone.SetCharAt('+', 3)) {
return NS_ERROR_FAILURE;
}
}
// Set the timezone only when the system timezone is not identical.
nsCString curTimezone = hal::GetTimezone();
if (!curTimezone.Equals(newTimezone)) {
hal::SetTimezone(newTimezone);
}
return NS_OK;
}
TimeZoneSettingObserver::~TimeZoneSettingObserver()
{
nsCOMPtr<nsIObserverService> observerService = services::GetObserverService();
if (observerService) {
observerService->RemoveObserver(this, MOZSETTINGS_CHANGED);
}
}
NS_IMPL_ISUPPORTS(TimeZoneSettingObserver, nsIObserver)
NS_IMETHODIMP
TimeZoneSettingObserver::Observe(nsISupports *aSubject,
const char *aTopic,
const char16_t *aData)
{
if (strcmp(aTopic, MOZSETTINGS_CHANGED) != 0) {
return NS_OK;
}
// Note that this function gets called for any and all settings changes,
// so we need to carefully check if we have the one we're interested in.
//
// The string that we're interested in will be a JSON string that looks like:
// {"key":"time.timezone","value":"America/Chicago"} or
// {"key":"time.timezone","value":"UTC-05:00"}
AutoSafeJSContext cx;
RootedDictionary<SettingChangeNotification> setting(cx);
if (!WrappedJSToDictionary(cx, aSubject, setting)) {
return NS_OK;
}
if (!setting.mKey.EqualsASCII(TIME_TIMEZONE)) {
return NS_OK;
}
if (!setting.mValue.isString()) {
return NS_OK;
}
// Set the system timezone.
return SetTimeZone(setting.mValue, cx);
}
} // namespace
static mozilla::StaticRefPtr<TimeZoneSettingObserver> sTimeZoneSettingObserver;
namespace mozilla {
namespace system {
void
InitializeTimeZoneSettingObserver()
{
sTimeZoneSettingObserver = new TimeZoneSettingObserver();
ClearOnShutdown(&sTimeZoneSettingObserver);
}
} // namespace system
} // namespace mozilla
|
